spoils vs tailings

spoils

noun
  • Waste material left over in the course of excavation, construction, mining, or dredging operations. 

  • That which is taken from another by violence; especially, the plunder taken from an enemy; pillage; booty. 

  • Public offices and their benefits regarded as the peculiar property of a successful party or faction, to be bestowed for its own advantage. 

tailings

noun
  • The waste that remains after the minerals have been extracted from an ore by ore dressing. 

  • The feints, the last fraction of product obtained at the end of distillation. 

How often have the words spoils and tailings occurred in a corpus of books? (source: Google Ngram Viewer )